A kind of gunlock having a steel wheel that rubbed against a flint
A gun having such a gunlock
(wheel lock) an obsolete gunlock using flint and a revolving wheel
(Wheel-lock) Wheellock, wheel-lock or wheel lock, is a mechanism for firing a firearm. It was the next major development in firearms technology after the matchlock and the first self-igniting firearm. The mechanism is so-called because it uses a rotating steel wheel to provide ignition.
(Wheel-Lock) A firearm with an ignition system in which iron pyrite (fool's gold!) is struck by the edge of a serrated wheel put under spring tension (similar to a cigarette lighter).
substitution: an event in which one thing is substituted for another; "the replacement of lost blood by a transfusion of donor blood"
A person or thing that takes the place of another
refilling: filling again by supplying what has been used up
The action or process of replacing someone or something
the act of furnishing an equivalent person or thing in the place of another; "replacing the star will not be easy"
Pike Island Gate Replacement
WEST VIRGINIA — The Pittsburgh District’s Repair Party has been undertaking the huge task of replacing the miter gates at Pike Island Locks and Dam, near Wheeling, W.Va., Nov. 2010. The gate leaves weigh in at approximately 127 tons each for the upper and 150 tons each for the lower pair. Once secured, the new gates will allow the lock to continue to raise or lower river traffic to the next pool level on their journey. (U.S. Army Corps of Engineers photo by Doug Christian)
The Falkirk Wheel
From the Rough Castle tunnel end.
The Falkirk Wheel boat lift is an exceptional feat of modern engineering and is already being recognised as an inspirational sculpture for the 21st Century.
Designed to reconnect the Forth & Clyde and Union Canals and sited in a natural open amphitheatre at Rough Castle near Falkirk, this remarkable and elegant mechanical marvel is the only rotating boat lift in the world and truly one of a kind.